list_pos_shifts

ServerSapo
CategoryRead

WHAT IT DOES

What list_pos_shifts does on Sapo

AI agents call list_pos_shifts to retrieve information from Sapo without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why list_pos_shifts needs a policy

This tool retrieves and displays POS shift records with financial summary information (cash balances) but does not modify, execute operations, or commit financial transactions. It is a straightforward query operation with no side effects. While it accesses financial-adjacent data, the tool itself performs no financial operations—it merely reports existing cash drawer session details.

From the tool's definition Tool name 'list_pos_shifts' and description verb 'List' indicate data retrieval. Returns 'paginated results via since_id cursor' with no mention of modification, deletion, or execution.

Documented attack patterns abuse exactly the kind of access list_pos_shifts gives an agent:

POLICY

How to control list_pos_shifts

PolicyLayer is an MCP gateway — it sits between your AI agents and Sapo, and nothing reaches the server without passing your rules. This is the rule we recommend for list_pos_shifts:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_pos_shifts": {}
  }
}

list_pos_shifts is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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EXPLORE

Related tools and policies

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_pos_shifts

What does the list_pos_shifts tool do? +

[UNDOCUMENTED endpoint, verified 2026-04-30, schema may change] List POS shifts (cash drawer sessions). For store owners — view opening/closing cash balances per shift. Returns paginated results via since_id cursor. It is categorised as a Read tool in the Sapo MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_pos_shifts? +

Register the Sapo MCP server in PolicyLayer and add a rule for list_pos_shifts: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Sapo. Nothing to install.

What risk level is list_pos_shifts? +

list_pos_shifts is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_pos_shifts? +

Yes. Add a rate_limit block to the list_pos_shifts rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block list_pos_shifts completely? +

Set action: deny in the PolicyLayer policy for list_pos_shifts. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides list_pos_shifts? +

list_pos_shifts is provided by the Sapo MCP server (nguyennguyenit/sapo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Sapo tool call.

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